Audi has already set a high standard in terms of in-car audio systems through collaborations with premium suppliers Bang & Olufsen and Bose. Now its development engineers are looking to usher in the next revolution of in-car hi-fi with the Audi Sound Concept. To help bring a physical principle called "wave field synthesis" to the automobile, the company has crammed a standard Audi Q7 with 62 speakers - five woofers and five tweeters plus 52 mid-range speakers.